JP2021133411A - Rolling control method, rolling control device, and production method for metal strip - Google Patents

Rolling control method, rolling control device, and production method for metal strip Download PDF

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JP2021133411A
JP2021133411A JP2020033130A JP2020033130A JP2021133411A JP 2021133411 A JP2021133411 A JP 2021133411A JP 2020033130 A JP2020033130 A JP 2020033130A JP 2020033130 A JP2020033130 A JP 2020033130A JP 2021133411 A JP2021133411 A JP 2021133411A
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rolling
metal strip
twist
rolling mill
metal band
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宏 安原
Hiroshi Yasuhara
宏 安原
渉 馬場
Wataru Baba
渉 馬場
信一郎 青江
Shinichiro Aoe
信一郎 青江
由紀雄 高嶋
Yukio Takashima
由紀雄 高嶋
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JFE Steel Corp
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Abstract

To provide a rolling control method, a rolling control device, and a production method for a metal strip, which enable rolling of buckled portions to be suppressed by detecting a sign of occurrence of buckle and interrupting rolling in advance.SOLUTION: A rolling control method for a metal strip according to the present invention includes a calculation step of calculating twist of the metal strip on the entry side of a rolling mill, and a rolling control step of stopping the rolling step of the metal strip performed by the rolling mill when the twist of the metal strip calculated in the calculation step is equal to or more than a predetermined threshold value. The rolling control method further includes a step of calculating a C warp of the metal strip on the entry side of the rolling mill. In the rolling control step, the rolling step of the metal strip by the rolling mill may be stopped when the twist and C warp of the metal strip are each equal to or more than the predetermined threshold value.SELECTED DRAWING: Figure 2

Description

本発明は、金属帯の圧延制御方法、圧延制御装置、及び製造方法に関する。 The present invention relates to a method for controlling rolling of a metal strip, a rolling control device, and a method for manufacturing.

一般的な金属帯の圧延工程では、平坦な金属帯を製造するために、圧延時の金属帯の平坦度をリアルタイムで測定し、測定された平坦度が目標値と一致するように形状制御アクチュエータを操作することが行われている。しかしながら、圧延前の金属帯の平坦度が極端に悪い場合、圧延後の金属帯の形状を平坦に制御しても金属帯に絞りと呼ばれる線状の疵が発生することがある。そして、金属帯の絞り部分を圧延した場合、圧延ロールに疵が入り、圧延ロールの交換のためにロスタイムが発生して生産能率が低下することがある。 In a general metal strip rolling process, in order to produce a flat metal strip, the flatness of the metal strip during rolling is measured in real time, and a shape control actuator is used so that the measured flatness matches the target value. Is being manipulated. However, when the flatness of the metal strip before rolling is extremely poor, linear flaws called drawing may occur in the metal strip even if the shape of the metal strip after rolling is controlled to be flat. When the drawn portion of the metal strip is rolled, the rolling roll may be flawed, resulting in loss time due to replacement of the rolling roll and a decrease in production efficiency.

一般に、金属帯の平坦度は、急峻度や伸び差率、I−Unitによって表される。具体的には、急峻度λ’は、以下の数式(1)に示すように図5に示す金属帯Sの波高さδと波のピッチLの比によって表される。また、伸び差率Δεは、以下の数式(2)に示すように図5に示す金属帯Sの伸び差ΔLと波のピッチLの比によって表される。また、金属帯Sの形状を正弦曲線で近似した場合、急峻度λ’と伸び差率Δεは以下の数式(3)に示す関係にある。また、I−Unitは、以下の数式(4)に示すように伸び差率Δεを10の5乗倍した値になる。 Generally, the flatness of the metal band is represented by the steepness, the elongation difference ratio, and the I-Unit. Specifically, the steepness λ'is represented by the ratio of the wave height δ of the metal band S shown in FIG. 5 to the wave pitch L as shown in the following mathematical formula (1). Further, the elongation difference rate Δε is represented by the ratio of the elongation difference ΔL of the metal band S shown in FIG. 5 to the wave pitch L as shown in the following mathematical formula (2). Further, when the shape of the metal band S is approximated by a sinusoidal curve, the steepness λ'and the elongation difference rate Δε are in the relationship shown in the following mathematical formula (3). Further, I-Unit is a value obtained by multiplying the elongation difference rate Δε by 10 to the 5th power as shown in the following mathematical formula (4).

Figure 2021133411
Figure 2021133411

Figure 2021133411
Figure 2021133411

Figure 2021133411
Figure 2021133411

Figure 2021133411
Figure 2021133411

圧延時に金属帯の平坦度を測定する手法としては、例えば圧延ロールを幅方向に分割してそれぞれに荷重検出センサを埋め込んだディスク構造の平坦度計を用いて、金属帯と圧延ロールとの間の接触荷重を測定して金属帯の形状を算出する手法がある。また、形状制御アクチュエータとしては、ワークロールの軸心撓みを変化させて金属帯の形状を制御するために、ワークロールの両端にベンダ力を付与するロールベンダ機構や片テーパの中間ロールを幅方向にシフトする中間ロールシフト機構がある。また、液圧によってロールクラウンを操作するVC(Variable Crown)ロール機構等もある。 As a method for measuring the flatness of a metal strip during rolling, for example, a flatness meter having a disk structure in which a rolling roll is divided in the width direction and a load detection sensor is embedded in each of the rolling rolls is used between the metal strip and the rolling roll. There is a method of calculating the shape of a metal band by measuring the contact load of. Further, as the shape control actuator, in order to control the shape of the metal band by changing the axial deflection of the work roll, a roll bender mechanism that applies bender force to both ends of the work roll and an intermediate roll with a single taper are used in the width direction. There is an intermediate roll shift mechanism that shifts to. There is also a VC (Variable Crown) roll mechanism that operates the roll crown by hydraulic pressure.

一方、特許文献1には、特に熱間圧延後の調質圧延工程において、熱間圧延工程、冷却工程、及び巻き取り工程における金属帯の形状(平坦度)の変化を予測し、調質圧延工程後の金属帯の形状を最適とするように設定値を決定する圧延制御方法が提案されている。 On the other hand, Patent Document 1 predicts changes in the shape (flatness) of the metal strip in the hot rolling step, the cooling step, and the winding step, especially in the temper rolling step after hot rolling, and temper rolling. A rolling control method has been proposed in which a set value is determined so as to optimize the shape of the metal strip after the process.

特開2016−49553号公報Japanese Unexamined Patent Publication No. 2016-49553

しかしながら、特許文献1に記載の圧延制御方法は、金属帯の平坦度の制御という観点でのみ圧延制御を行っており、絞り部の圧延(絞り込み)防止の観点による圧延制御は行われていない。 However, the rolling control method described in Patent Document 1 performs rolling control only from the viewpoint of controlling the flatness of the metal band, and does not perform rolling control from the viewpoint of preventing rolling (narrowing) of the drawn portion.

本発明は、上記課題に鑑みてなされたものであって、その目的は、絞り発生の予兆を検知して事前に圧延を中断することにより絞り部を圧延することを抑制可能な金属帯の圧延制御方法、圧延制御装置、及び製造方法を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to roll a metal strip capable of suppressing rolling of a drawn portion by detecting a sign of drawing occurrence and interrupting rolling in advance. It is an object of the present invention to provide a control method, a rolling control device, and a manufacturing method.

本発明に係る金属帯の圧延制御方法は、圧延機の入側における金属帯の捩れを算出する算出ステップと、前記算出ステップにおいて算出された金属帯の捩れが所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止する圧延制御ステップと、を含むことを特徴とする。 The method for controlling rolling of a metal band according to the present invention is described in a calculation step of calculating the twist of the metal band on the entry side of the rolling mill and when the twist of the metal band calculated in the calculation step is equal to or greater than a predetermined threshold value. It is characterized by including a rolling control step for stopping the rolling process of the metal strip by the rolling mill.

本発明に係る金属帯の圧延制御方法は、上記発明において、前記圧延機の入側における金属帯のC反りを算出するステップを含み、前記圧延制御ステップは、金属帯の捩れ及びC反りがそれぞれ所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止するステップを含むことを特徴とする。 In the above invention, the method for controlling rolling of a metal band according to the present invention includes a step of calculating the C warp of the metal band on the entry side of the rolling mill, and the rolling control step includes twisting and C warping of the metal band, respectively. When it is equal to or more than a predetermined threshold value, it is characterized by including a step of discontinuing the rolling process of the metal strip by the rolling mill.

本発明に係る金属帯の圧延制御装置は、圧延機の入側における金属帯の幅方向の高さ分布を測定する測定手段と、前記測定手段によって測定された金属帯の幅方向の高さ分布から金属帯の捩れを算出し、捩れが所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止する制御手段と、を備えることを特徴とする。 The rolling control device for a metal strip according to the present invention includes a measuring means for measuring the height distribution of the metal strip in the width direction on the entrance side of the rolling mill, and a height distribution in the width direction of the metal strip measured by the measuring means. The twist of the metal strip is calculated from the above, and when the twist is equal to or greater than a predetermined threshold value, a control means for stopping the rolling process of the metal strip by the rolling mill is provided.

本発明に係る金属帯の圧延制御装置は、上記発明において、前記制御手段は、前記圧延機の入側における金属帯のC反りを算出し、金属帯の捩れ及びC反りがそれぞれ所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止することを特徴とする。 In the above invention, the metal strip rolling control device according to the present invention calculates the C warp of the metal strip on the entry side of the rolling mill, and the twist and C warp of the metal strip are each equal to or more than a predetermined threshold value. If this is the case, the process of rolling the metal strip by the rolling mill is stopped.

本発明に係る金属帯の製造方法は、本発明に係る金属帯の圧延制御方法を利用して金属帯を製造するステップを含むことを特徴とする。 The method for producing a metal band according to the present invention is characterized by including a step of producing a metal band by utilizing the method for controlling rolling of the metal band according to the present invention.

本発明に係る金属帯の圧延制御方法、圧延制御装置、及び製造方法によれば、絞り発生の予兆を検知して事前に圧延を中断することにより絞り部を圧延することを抑制することができる。 According to the rolling control method, the rolling control device, and the manufacturing method for the metal strip according to the present invention, it is possible to suppress rolling of the drawn portion by detecting a sign of drawing occurrence and interrupting rolling in advance. ..

図1は、本発明の一実施形態である金属帯の圧延制御方法が適用される圧延機の一構成例を示す模式図である。FIG. 1 is a schematic view showing a configuration example of a rolling mill to which the method for controlling rolling of a metal band according to an embodiment of the present invention is applied. 図2は、本発明の一実施形態である圧延制御処理の流れを示すフローチャートである。FIG. 2 is a flowchart showing a flow of rolling control processing according to an embodiment of the present invention. 図3は、金属帯の捩れ及びC反りを説明するための図である。FIG. 3 is a diagram for explaining the twist and C warp of the metal band. 図4は、金属帯の捩れ及びC反りを説明するための図である。FIG. 4 is a diagram for explaining the twist and C warp of the metal band. 図5は、金属帯の急峻度及び伸び差率を説明するための図である。FIG. 5 is a diagram for explaining the steepness and elongation difference ratio of the metal band.

以下、図面を参照して、本発明の一実施形態である金属帯の圧延制御方法について説明する。 Hereinafter, a method for controlling rolling of a metal strip according to an embodiment of the present invention will be described with reference to the drawings.

〔圧延機の構成〕
まず、図1を参照して、本発明の一実施形態である金属帯の圧延制御方法が適用される圧延機の構成について説明する。
[Structure of rolling mill]
First, with reference to FIG. 1, a configuration of a rolling mill to which the method for controlling rolling of a metal strip according to an embodiment of the present invention is applied will be described.

図1は、本発明の一実施形態である圧延制御方法が適用される圧延機の一構成例を示す模式図である。図1に示すように、本発明の一実施形態である金属帯の圧延制御方法が適用される圧延機1は、リール2a及びリール2bを用いて金属帯Sの払い出し及び巻き取りを行いながら金属帯Sを圧延することによって金属帯Sの形状を矯正する4段式圧延機であり、一対のワークロール3a,3b、一対のバックアップロール4a,4b、レーザスキャナ5、平坦度計6、及び制御装置7を備えている。 FIG. 1 is a schematic view showing a configuration example of a rolling mill to which the rolling control method according to the embodiment of the present invention is applied. As shown in FIG. 1, in the rolling mill 1 to which the rolling control method for the metal strip according to the embodiment of the present invention is applied, the metal strip S is dispensed and wound up by using the reels 2a and 2b. A four-stage rolling mill that corrects the shape of the metal strip S by rolling the strip S, and is a pair of work rolls 3a and 3b, a pair of backup rolls 4a and 4b, a laser scanner 5, a flatness meter 6, and a control. The device 7 is provided.

一対のワークロール3a,3bは、金属帯Sを矢印方向に搬送する搬送経路を挟んで金属帯Sの板厚方向に対向配置されている。ワークロール3a,3bは、搬送経路に沿って順次搬送される金属帯Sをその板厚方向において挟み込みながら回転(自転)することにより、金属帯Sを連続的に圧延する。 The pair of work rolls 3a and 3b are arranged so as to face each other in the plate thickness direction of the metal strip S with a transport path for transporting the metal strip S in the arrow direction. The work rolls 3a and 3b continuously roll the metal strip S by rotating (rotating) while sandwiching the metal strip S sequentially transported along the transport path in the plate thickness direction.

一対のバックアップロール4a,4bは、一対のワークロール3a,3bを挟んで対向配置されている。上側のバックアップロール4aは、上側のワークロール3aの外周面に上方向から接触し、上側のワークロール3aを下方向に押圧する。これにより、上側のバックアップロール4aは金属帯Sの圧延に要する荷重を上側のワークロール3aに付与する。また、下側のバックアップロール4bは、下側のワークロール3bの外周面に下方向から接触し、下側のワークロール3bを上方向に押圧する。これにより、下側のバックアップロール4bは金属帯Sの圧延に要する荷重を下側のワークロール3bに付与する。 The pair of backup rolls 4a and 4b are arranged so as to face each other with the pair of work rolls 3a and 3b interposed therebetween. The upper backup roll 4a contacts the outer peripheral surface of the upper work roll 3a from above and presses the upper work roll 3a downward. As a result, the upper backup roll 4a applies the load required for rolling the metal strip S to the upper work roll 3a. Further, the lower backup roll 4b comes into contact with the outer peripheral surface of the lower work roll 3b from below, and presses the lower work roll 3b upward. As a result, the lower backup roll 4b applies the load required for rolling the metal strip S to the lower work roll 3b.

なお、図示しないが、一対のバックアップロール4a,4bには形状制御アクチュエータとしてロールベンダ機構が接続されている。ロールベンダ機構は、圧延機1による圧延後の金属帯Sの形状を制御する形状制御部として機能する。具体的には、ロールベンダ機構は、一対のバックアップロール4a,4bを介して一対のワークロール3a,3bに撓み又は傾斜を付与することにより、圧延機1による圧延後の金属帯Sの形状を制御する。ロールベンダ機構の動作は、制御装置7によって制御される。 Although not shown, a roll bender mechanism is connected to the pair of backup rolls 4a and 4b as a shape control actuator. The roll bender mechanism functions as a shape control unit that controls the shape of the metal strip S after rolling by the rolling mill 1. Specifically, the roll bender mechanism imparts bending or inclination to the pair of work rolls 3a, 3b via the pair of backup rolls 4a, 4b to obtain the shape of the metal strip S after rolling by the rolling mill 1. Control. The operation of the roll bender mechanism is controlled by the control device 7.

レーザスキャナ5は、2次元や3次元のレーザスキャナによって構成され、圧延機1の入側に設置されている。レーザスキャナ5は、圧延機1の入側における金属帯Sの幅方向の高さ分布を測定し、測定された幅方向の高さ分布を示す電気信号を制御装置7に入力する。なお、金属帯Sの高さ分布の測定位置は、絞り発生の予兆を早期に検出できるように、圧延機1の入側のできるだけワークロール3a,3bに近い位置とすることが望ましい。また、レーザスキャナ5の検出部に埃が堆積することによって検出エラーが発生することを抑制するために、検出部ができるだけ下向きになるようにレーザスキャナ5を設置することが望ましい。 The laser scanner 5 is composed of a two-dimensional or three-dimensional laser scanner and is installed on the entrance side of the rolling mill 1. The laser scanner 5 measures the height distribution of the metal band S in the width direction on the entrance side of the rolling mill 1, and inputs an electric signal indicating the measured height distribution in the width direction to the control device 7. It is desirable that the measurement position of the height distribution of the metal band S is as close as possible to the work rolls 3a and 3b on the entry side of the rolling mill 1 so that the sign of the occurrence of drawing can be detected at an early stage. Further, in order to suppress the occurrence of a detection error due to the accumulation of dust on the detection unit of the laser scanner 5, it is desirable to install the laser scanner 5 so that the detection unit faces downward as much as possible.

平坦度計6は、ロール式の平坦度計によって構成され、圧延機1の出側に設置されている。平坦度計6は、圧延機1の出側における金属帯Sの形状を測定し、測定された形状を示す電気信号を制御装置7に入力する。 The flatness meter 6 is composed of a roll-type flatness meter and is installed on the outlet side of the rolling mill 1. The flatness meter 6 measures the shape of the metal band S on the exit side of the rolling mill 1, and inputs an electric signal indicating the measured shape to the control device 7.

制御装置7は、コンピュータ等の情報処理装置によって構成され、レーザスキャナ5及び平坦度計6から入力された電気信号を用いて圧延機1全体の動作を制御する。また、本実施形態では、制御装置7は、以下に示す圧延制御処理を実行することにより、絞り発生の予兆を検知して事前に圧延を中断することにより絞り部を圧延することを抑制する。 The control device 7 is composed of an information processing device such as a computer, and controls the operation of the entire rolling mill 1 by using an electric signal input from the laser scanner 5 and the flatness meter 6. Further, in the present embodiment, the control device 7 executes the rolling control process shown below to detect a sign of the occurrence of drawing and interrupt the rolling in advance to suppress rolling of the drawn portion.

〔圧延制御処理〕
次に、図2を参照して、圧延制御処理を実行する際の制御装置7の動作について説明する。
[Rolling control process]
Next, the operation of the control device 7 when executing the rolling control process will be described with reference to FIG.

図2は、本発明の一実施形態である圧延制御処理の流れを示すフローチャートである。図2は、制御装置7に対して圧延制御処理の実行指令が入力されたタイミングで開始となり、圧延制御処理はステップS1の処理に進む。この圧延制御処理は、金属帯Sの圧延工程が完了又は中止されるまでの間、所定の制御周期毎に繰り返し実行される。 FIG. 2 is a flowchart showing a flow of rolling control processing according to an embodiment of the present invention. FIG. 2 starts at the timing when the execution command of the rolling control process is input to the control device 7, and the rolling control process proceeds to the process of step S1. This rolling control process is repeatedly executed at predetermined control cycles until the rolling process of the metal strip S is completed or stopped.

ステップS1の処理では、制御装置7が、レーザスキャナ5によって計測された圧延機1の入側における金属帯Sの幅方向の高さ分布に基づいて金属帯Sの捩れを算出する。具体的には、制御装置7は、図3に示すように、金属帯Sの幅方向両端部を結んだ直線L1の水平方向(直線L2)に対する傾きθを捩れとして算出する。但し、捩れは、水平方向に対する金属帯Sの傾きを表現した指標であればよく、例えば図4に示すように、金属帯Sの高さ分布L3を2次曲線で近似した場合の1次の項の係数bを捩れと定義してもよいし、金属帯Sの高さ分布L3を4次曲線で近似した場合の3次の項の係数eと1次の項の係数gの和e+gを捩れと定義してもよい。これにより、ステップS1の処理は完了し、圧延制御処理はステップS2の処理に進む。 In the process of step S1, the control device 7 calculates the twist of the metal band S based on the height distribution in the width direction of the metal band S on the entrance side of the rolling mill 1 measured by the laser scanner 5. Specifically, as shown in FIG. 3, the control device 7 calculates the inclination θ of the straight line L1 connecting both ends of the metal band S in the width direction with respect to the horizontal direction (straight line L2) as a twist. However, the twist may be an index expressing the inclination of the metal band S with respect to the horizontal direction. For example, as shown in FIG. 4, the twist is the first order when the height distribution L3 of the metal band S is approximated by a quadratic curve. The coefficient b of the term may be defined as a twist, or the sum e + g of the coefficient e of the cubic term and the coefficient g of the linear term when the height distribution L3 of the metal band S is approximated by a quadratic curve. It may be defined as a twist. As a result, the process of step S1 is completed, and the rolling control process proceeds to the process of step S2.

ステップS2の処理では、制御装置7が、レーザスキャナ5によって計測された圧延機1の入側における金属帯Sの幅方向の高さ分布に基づいて金属帯SのC反りを算出する。具体的には、制御装置7は、図3に示すように、金属帯Sの幅方向両端部を結んだ直線L1と金属帯Sの幅方向中央部との間の距離HをC反りとして算出する。但し、C反りは、金属帯Sの幅方向端部の高さと幅方向中央部の高さの差を表現した指標であればよく、例えば図4に示すように、金属帯Sの高さ分布L3を2次曲線で近似した場合の2次の項の係数aをC反りと定義してもよいし、金属帯Sの高さ分布L3を4次曲線で近似した場合の4次の項の係数dと2次の項の係数fの和d+fをC反りと定義してもよい。これにより、ステップS2の処理は完了し、圧延制御処理はステップS3の処理に進む。 In the process of step S2, the control device 7 calculates the C warp of the metal band S based on the height distribution in the width direction of the metal band S on the entrance side of the rolling mill 1 measured by the laser scanner 5. Specifically, as shown in FIG. 3, the control device 7 calculates the distance H between the straight line L1 connecting both ends in the width direction of the metal band S and the central portion in the width direction of the metal band S as the C warp. do. However, the C warp may be an index expressing the difference between the height of the end portion in the width direction and the height of the center portion in the width direction of the metal band S. For example, as shown in FIG. 4, the height distribution of the metal band S is used. The coefficient a of the quadratic term when L3 is approximated by a quadratic curve may be defined as C warp, or the height distribution L3 of the metal band S may be defined as the quaternary term when approximated by a quadratic curve. The sum d + f of the coefficient d and the coefficient f of the quadratic term may be defined as C warp. As a result, the process of step S2 is completed, and the rolling control process proceeds to the process of step S3.

ステップS3の処理では、制御装置7が、ステップS1の処理において算出された金属帯Sの捩れ及び/又はステップS2の処理において算出された金属帯SのC反りがそれぞれ閾値以上であるか否かを判別する。判別の結果、金属帯Sの捩れ及び/又はC反りがそれぞれ閾値以上である場合(ステップS3:Yes)、制御装置7は、圧延制御処理をステップS4の処理に進める。一方、金属帯Sの捩れ及び/又はC反りが閾値以上でない場合には(ステップS3:No)、制御装置7は、一連の圧延制御処理を終了する。なお、制御装置7は、金属帯Sの捩れが閾値以上である場合に圧延制御処理をステップS4の処理に進めるようにしてもよい。また、上記閾値は、圧延機1の圧延条件に応じて変化する値であり、圧延実績に基づいて予め決定されているものとする。 In the process of step S3, the control device 7 determines whether the twist of the metal band S calculated in the process of step S1 and / or the C warp of the metal band S calculated in the process of step S2 is equal to or greater than the threshold value. To determine. As a result of the determination, when the twist and / or the C warp of the metal band S is equal to or higher than the threshold value (step S3: Yes), the control device 7 advances the rolling control process to the process of step S4. On the other hand, when the twist and / or C warp of the metal band S is not equal to or more than the threshold value (step S3: No), the control device 7 ends a series of rolling control processes. The control device 7 may proceed with the rolling control process to the process of step S4 when the twist of the metal band S is equal to or greater than the threshold value. Further, the threshold value is a value that changes according to the rolling conditions of the rolling mill 1, and is determined in advance based on the rolling results.

ステップS4の処理では、制御装置7が、絞り発生の予兆があると判断し、圧延機1による金属帯Sの圧延を中止する。金属帯Sの圧延中止に応じて、オペレータは、金属帯Sの絞り発生の予兆がある部分をカット又は圧延せずにリール2b側に送る。これにより、ステップS4の処理は完了し、一連の圧延制御処理は終了する。 In the process of step S4, the control device 7 determines that there is a sign of drawing occurrence, and stops rolling the metal strip S by the rolling mill 1. In response to the suspension of rolling of the metal strip S, the operator sends the portion of the metal strip S that has a sign of drawing of the metal strip S to the reel 2b side without cutting or rolling. As a result, the process of step S4 is completed, and a series of rolling control processes is completed.

以上の説明から明らかなように、本発明の一実施形態である圧延制御処理では、制御装置7が、圧延機1の入側における金属帯Sの捩れを算出し、金属帯Sの捩れが所定の閾値以上である場合、圧延機1による金属帯Sの圧延工程を中止するので、絞り発生の予兆を検知して事前に圧延を中断することにより絞り部を圧延することを抑制できる。 As is clear from the above description, in the rolling control process according to the embodiment of the present invention, the control device 7 calculates the twist of the metal band S on the entry side of the rolling mill 1, and the twist of the metal band S is predetermined. When the value is equal to or greater than the threshold value of, the rolling process of the metal strip S by the rolling mill 1 is stopped, so that the rolling of the drawn portion can be suppressed by detecting the sign of the occurrence of drawing and interrupting the rolling in advance.

〔実施例1〕
本実施例では、図1に示す4段式圧延機を用いて、入側板厚0.550mm、出側板厚0.545mm、板幅1100mmの軟鋼板を圧延した。圧延機のワークロール径はφ450mm、バックアップロール径はφ1200mmとした。圧延機の張力は入側100MPa、出側80MPaに設定した。軟鋼板の幅方向両端部を結んだ直線の水平方向に対する傾きを捩れと定義し、過去に絞りが発生せずに圧延できたコイルの捩れの最大値である0.05radより捩れが大きい場合、絞り発生の予兆があるとして圧延を中断した。この結果、4300コイル圧延して絞りは発生しなかった。絞り発生の予兆があるとして圧延を中断したコイルは1コイルあった。一方、絞り予兆を検知しても圧延を続行する実験を続けて行った結果、4300コイル圧延して2コイルで絞りの予兆を検知し、絞りの予兆を検知した2コイルとも絞りが発生した。以上のことから、金属帯Sの捩れが閾値以上である場合に圧延を中止することにより、絞り部を圧延することを抑制できることが確認された。
[Example 1]
In this embodiment, a mild steel plate having an inlet side plate thickness of 0.550 mm, an outlet side plate thickness of 0.545 mm, and a plate width of 1100 mm was rolled using the 4-stage rolling mill shown in FIG. The work roll diameter of the rolling mill was φ450 mm, and the backup roll diameter was φ1200 mm. The tension of the rolling mill was set to 100 MPa on the inlet side and 80 MPa on the outlet side. The inclination of the straight line connecting both ends in the width direction of the mild steel plate with respect to the horizontal direction is defined as twist, and when the twist is larger than the maximum twist of 0.05 rad, which is the maximum twist of the coil that could be rolled without drawing in the past. Rolling was interrupted because there was a sign of drawing. As a result, 4300 coils were rolled and no drawing was generated. There was one coil in which rolling was interrupted because there was a sign of drawing. On the other hand, as a result of continuing the experiment of continuing rolling even if the sign of drawing was detected, 4300 coils were rolled, the sign of drawing was detected by 2 coils, and the 2 coils that detected the sign of drawing generated drawing. From the above, it was confirmed that rolling of the drawn portion can be suppressed by stopping rolling when the twist of the metal band S is equal to or greater than the threshold value.

〔実施例2〕
本実施例では、図1に示す4段式圧延機を用いて、入側板厚0.550mm、出側板厚0.545mm、板幅1100mmの軟鋼板を圧延した。圧延機のワークロール径はφ450mm、バックアップロール径はφ1200mmとした。圧延機の張力は入側100MPa、出側80MPaに設定した。軟鋼板の幅方向両端部を結んだ直線と板幅中央との距離をC反り、鋼板の幅方向両端部を結んだ直線の水平方向に対する傾きを捩れと定義し、過去に絞りが発生せずに圧延できたコイルの実績より、C反り20mm以上及び捩れ0.05rad以上を絞り発生の予兆と判定することとした。C反り及び捩れの双方を測定して、絞り発生の予兆がある場合に圧延を中断した。この結果、4000コイル圧延して絞りは発生しなかった。絞り発生の予兆があるとして圧延を中断したコイルが1コイルあった。以上のことから、金属帯SのC反り及び捩れが閾値以上である場合に圧延を中断することにより、絞り部を圧延することを抑制できることが確認された。
[Example 2]
In this embodiment, a mild steel plate having an inlet side plate thickness of 0.550 mm, an outlet side plate thickness of 0.545 mm, and a plate width of 1100 mm was rolled using the 4-stage rolling mill shown in FIG. The work roll diameter of the rolling mill was φ450 mm, and the backup roll diameter was φ1200 mm. The tension of the rolling mill was set to 100 MPa on the inlet side and 80 MPa on the outlet side. The distance between the straight line connecting both ends in the width direction of the mild steel plate and the center of the plate width is defined as C warp, and the inclination of the straight line connecting both ends in the width direction of the steel plate with respect to the horizontal direction is defined as twist. Based on the actual results of the coil that could be rolled into a steel sheet, it was decided that a C warp of 20 mm or more and a twist of 0.05 rad or more were judged to be signs of the occurrence of drawing. Both C warp and twist were measured, and rolling was interrupted when there was a sign of drawing. As a result, 4000 coils were rolled and no drawing was generated. There was one coil in which rolling was interrupted because there was a sign of drawing. From the above, it was confirmed that rolling of the drawn portion can be suppressed by interrupting rolling when the C warp and twist of the metal band S are equal to or greater than the threshold value.

以上、本発明者らによってなされた発明を適用した実施の形態について説明したが、本実施形態による本発明の開示の一部をなす記述及び図面により本発明は限定されることはない。すなわち、本実施形態に基づいて当業者等によりなされる他の実施の形態、実施例、及び運用技術等は全て本発明の範疇に含まれる。 Although the embodiment to which the invention made by the present inventors has been applied has been described above, the present invention is not limited by the description and the drawings which form a part of the disclosure of the present invention according to the present embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

1 圧延機
2a,2b リール
3a,3b ワークロール
4a,4b バックアップロール
5 レーザスキャナ
6 平坦度計
7 制御装置
S 金属帯
1 Roller 2a, 2b Reel 3a, 3b Work roll 4a, 4b Backup roll 5 Laser scanner 6 Flatness meter 7 Control device S Metal strip

Claims (5)

圧延機の入側における金属帯の捩れを算出する算出ステップと、
前記算出ステップにおいて算出された金属帯の捩れが所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止する圧延制御ステップと、
を含むことを特徴とする金属帯の圧延制御方法。
A calculation step for calculating the twist of the metal strip on the entry side of the rolling mill, and
When the twist of the metal band calculated in the calculation step is equal to or greater than a predetermined threshold value, a rolling control step for stopping the rolling process of the metal band by the rolling mill and a rolling control step.
A method for controlling rolling of a metal strip, which comprises.
前記圧延機の入側における金属帯のC反りを算出するステップを含み、前記圧延制御ステップは、金属帯の捩れ及びC反りがそれぞれ所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止するステップを含むことを特徴とする請求項1に記載の金属帯の圧延制御方法。 The rolling control step includes a step of calculating the C warp of the metal strip on the entry side of the rolling mill, and the rolling control step rolls the metal strip by the rolling mill when the twist of the metal strip and the C warp are each equal to or more than a predetermined threshold value. The method for controlling rolling of a metal strip according to claim 1, further comprising a step of discontinuing the process. 圧延機の入側における金属帯の幅方向の高さ分布を測定する測定手段と、
前記測定手段によって測定された金属帯の幅方向の高さ分布から金属帯の捩れを算出し、捩れが所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止する制御手段と、
を備えることを特徴とする金属帯の圧延制御装置。
A measuring means for measuring the height distribution of the metal strip in the width direction on the entrance side of the rolling mill, and
A control means for calculating the twist of the metal band from the height distribution in the width direction of the metal band measured by the measuring means, and stopping the rolling process of the metal band by the rolling mill when the twist is equal to or more than a predetermined threshold value. ,
A metal strip rolling control device comprising.
前記制御手段は、前記圧延機の入側における金属帯のC反りを算出し、金属帯の捩れ及びC反りがそれぞれ所定の閾値以上である場合、前記圧延機による金属帯の圧延工程を中止することを特徴とする請求項3に記載の金属帯の圧延制御装置。 The control means calculates the C warp of the metal strip on the entry side of the rolling mill, and when the twist of the metal strip and the C warp are each equal to or more than a predetermined threshold value, the rolling process of the metal strip by the rolling mill is stopped. The rolling control device for a metal strip according to claim 3, characterized in that. 請求項1又は2に記載の金属帯の圧延制御方法を利用して金属帯を製造するステップを含むことを特徴とする金属帯の製造方法。 A method for producing a metal band, which comprises a step of producing the metal band by using the method for controlling rolling of the metal band according to claim 1 or 2.
JP2020033130A 2020-02-28 2020-02-28 Rolling control method, rolling control device, and production method for metal strip Pending JP2021133411A (en)

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